chore: logs os_log bout-en-bout (watch sendSample + iPhone liveSample) + hook AUTOSIM

Logger unified (capturable via simctl) côté watch (envoi) et iPhone (réception)
pour valider le pont WCSession. Hook AUTOSIM (env var) démarre le mode test au
lancement, pour validation automatisée sur simulateur. Pont prouvé E2E sur sim
pair iPhone+Watch : HR identiques watch->iPhone.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ios/App/CoachWatch/ContentView.swift

@@ -5,10 +5,19 @@ struct ContentView: View {
     @EnvironmentObject private var workout: WorkoutManager
 
     var body: some View {
-        if workout.isRunning {
-            LiveWorkoutView()
-        } else {
-            ActivityPickerView()
+        Group {
+            if workout.isRunning {
+                LiveWorkoutView()
+            } else {
+                ActivityPickerView()
+            }
+        }
+        .task {
+            // Déclenchement auto du mode test (validation simulateur) :
+            // SIMCTL_CHILD_AUTOSIM=1 xcrun simctl launch …
+            if ProcessInfo.processInfo.environment["AUTOSIM"] == "1" {
+                workout.startSimulation()
+            }
         }
     }
 }